alexander



v 2 Sheets-Sheet- 1.

` (No Model.)

' UyD. ALEXANDER. ASEV'I METAL WORKING MACHINE.

No. 540.013. Patente-a May 28, 1895.

INVENTOR,

2 Sheets-Sheet 2.

lILD. ALEXANDER.- SHEET METAL WORKING MACHINE. No. 540,013.

(No Model.)

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UNITED STATES erica.

URBANA D. ALEXANDER, OF OANNONSBURG, PENNSYLVANIA,ASSIGNOR OF ONE-.HALF TO THEOANONSBURGIRON'AND STEEL COMPANY, OF SAME PLACE.

`sHEI-:T-MHAL-WORKHSJG MACHINE.

SPECIFICATION forming part of Letters Patent N o. 540,013, dated May 28, 1895.

Application filed September 17, 1894. Serial No. 523,236. (No model.) i

To all whom it may concern:

Be it known that I, URBANA D. ALEXAN- DER, a citizen of the United States, residing at Cannonsburg, in the county of Washington and State of Pennsylvania, have invented or discovered certain new and useful Improvements in Sheet-Metal-Working Machines, of which improvements the following is a specification. Y

In the manufacture of stovepipes, the sheets from which they are formed must be cut to the proper width, the edges of thesheets atV one end thereof notched,and an offset or recess formed along one edge, for the reception of the lock or joint connecting the erges in the completed pipe. The foregoing operations have heretofore been effected successively in independent machines, thereby adding very materially to the cost of manufacture.

The object of the present invention is to provide a machine in which the several operations can be performed simultaneously, and, in general terms, the invention consists in the construction and combination, substantially as hereinafter described and claimed.

In the accompanying drawings, forming a part of this specification, Figure 1 is a sectional elevation of my improved machine. Fig. 2 is a rear end elevation partly in section, the plane of section being indicated by the line 2 2, Fig. 3. Fig. 3 is a sectional top. plan View, the plane of section being indicated by the line @c x, Fig. 1. Figs. 4 and 5 are detail views of the machine. Fig. 5LL is a sectional detail view on an enlarged scale, illustrating the operation of trimming and shaping the edges of two adjacent blanks; and Fig. 6 illustrates the sheets in side and edge elevation.

The sheet to be cut is placed on the bed 1 of the machine, one edge being placed against a stop 2, adjustably attached to the bed 1, and a stop on the knife or blade as will be hereinafter described. The sheet is pushed along longitudinally until its front end is under the knife 3, which is secured tothe movable cross-head 4. This cross-head is mounted in suitable guides in the uprights 5 and is connected at its ends to the straps 6 of the eccentrics 7, on the shaft 8, which can be rotated continuously or intermittentlyfas desired. In a recess' transverse of the bed plate and in line with the cross-head, are secured the female cutting blades 9 and 10, which are adjustably supported by set screws passing through the bottom of the recess. These blades are arranged a distance apart equal to the thickness of theknife 3. At one end these blades are formed on their inner faces, with an angular notch or groove 1,1, for the reception of corresponding' projections l2 on the sides of the knife 3, as shown in Figs. 2 and 4. This cutting device will cutoutot' a sheet pieces of metal corresponding to the opening between the blades 9 and 10, as shown in Fig. 3. By the conjoint action of thegrooves 1l and projections 12, the blanks are notched on opposite edges, as at a, in Fig. 6, the notch in the rear edge of one blank being formed simultaneous with the severing of the blank; from the sheet and the cutting of a notch in the front edge of the next succeeding blank. As shown in Figs. 2 and 4, the knife 3 is provided at one end with a downwardly projecting finger 13, which operates in conjunction with the stop 2 to guide the sheet as it is fed between the cutting devices.

As soon as the front edge of a sheet has been trimmed and properly notched, the sheet is pushed forward until its front end comes ih contact With stops 14 on the arms 15, when the knife is again operated to sever a blank from the sheet and notch its rear and also notch the front edge of the next blank.

The arms 15 are secured on a shaft 16 mounted in rearwardly projecting brackets 17, and are held with their free ends under the rearwardly projecting end of the bed plate by a Weight 18, attached to one end of astrap 19, whose opposite end is attached toa pulley 20, on one end of the shaft 16, as shown in Figs. 1 and 3. The shaft 16 is rotated to shift the arms to the position shown in dotted lines simultaneous with the severing of a blank from the sheet, by an eccentric pin 2l on one end of the shaft 8 and connected by arod 22 to Y IOO In order to form the offset or recess b along one edge of the sheet, as shown in Fig. 6, the blades 9 and 10 project a distance above the bed plate 1, proportional to the desired depth of the offset or recess, as shown in Figs. 1 and 2, and the outer face of the front blade 9 is cut away as at c, so as to make the upper or operative `edge of the blade of a width equal to the width of offset required. As the blade A9 projects above the bed l, the front edge of the sheet being cut will be correspondingly raised, so that as the knife 3, continues its descent after severing the blank, the plate 25, having the rib 24, will engage the portion of the sheet resting on the blade and adjacent thereto, and cause it to conform tothe upper edge of the blade 9, the rib 24 passing down into the notch in the side of the blade, but not below the plane of the surface of the bed, thereby producing the offset in the end of the sheet. This plate is so arranged that the rib will operate on the sheet immediately after the severing of a blank therefrom.

From the foregoing it will be seen that the three operations of severing the blank, cutting the notches and forming the offset or recess are performed simultaneously.

I claim herein as my invention- 1. In a sheet metal cutting machine, the combination of two parallel cutting blades, provided at or near one end of their inner faces, with angular grooves and a movable knife operating between said blades, and provided at or near one end with projections corresponding to said grooves, the blades and knives being of greater length than the Width of the sheets to be operated on, whereby the sheet is divided into suitable blanks and the adjacent edges of said blanks suitably shaped, by transversely eXsecting a portion of the sheet, substantially as set forth.

2. In a sheet metalworking machine, the combination of a stationary cutting blade provided with a shoulder, a reciprocating knife and a bending rib arranged on said knife a short distance back of its cutting edge, so as to cause the edge of the sheet to conform with the shoulder on the stationary cutting blade subsequent to the action of the knife, but by a continuous onward movement of thelatter, substantially as set forth.

3. In a sheet metal working machine, the

combination of a cutting mechanism, arms ar- NVitnesses:

DARWIN S. WALCOTT, F. E. GAITHER. 

